Tracking Count of Years and Months in Excel - excel

This is a bit of a complicated question for excel, so I'll try to explain as best I can.
I'm trying to track membership time for each member in a group in the member list which is an excel sheet. Currently I have 2 columns, one for years and one for months which are both calculating the proper time based on the Join date of the members. My issue comes when trying to calculate for the subsection of members who have 'broken' membership time, meaning they left the group and rejoined some time later. To correct for that I have a second sheet that tracks the previous time for those members (also in columns of years and months) and I'm trying to add it to the first sheet. The formulas I have are below:
-To calculate the number of years since the member joined, then add any previous years from the PrevTime sheet, matching on column B which is Name on my primary sheet:
=DATEDIF(F2,TODAY(),"y") + INDEX(PrevTime!A:C, MATCH(B2,PrevTime!A:A,0), 2)
-To calculate the number of months since the member joined, then add any previous months from the PrevTime sheet, matching on column B which is Name on my primary sheet.
=DATEDIF(F2,TODAY(),"ym") + INDEX(PrevTime!A:C, MATCH(B2,PrevTime!A:A,0), 3)
Now, everything works fine with both these formulas, the issue comes when the member in question has some combination of current membership time months, and previous membership months that exceed 12. Then I end up with one less year for their membership time and more than 12 months for their membership months. (i.e. 2 years, 15 Months instead of 3 years, 3 months).
Was just hoping someone here might have an idea or any insight into things I could try to sort this out so the times are displayed nicely without overflowing the months past 12.
Thanks in advance

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Reinvoice every 12 months

Trying to create an invoice to auto populate. Have done this in VBA previously, but now the sheet is going on the cloud, and being used by Excel online so, VBA is out, unfortunately!
Trying to make a membership fee reappear every 12 months based on their start date!
I was trying around with EDATE, and got it to work on my test subject, but then realized it wouldn't work as I'm only going off the first 12 months!
Need a fresh set of eyes to give me ideas, or walk me through a simple solution (if possible)
Currently have the following, which works for the first year, then it won't!
Cell X7 = =EDATE(TODAY(),3) <----- Creates the cut off for invoicing if Membership due before then.
Cell V12 = =VLOOKUP(O12,'Youth Details'!$A$4:$H$95,8,0) <---- Returns their start date. i.e 19-Nov-2020
Cell W12 = =IF(AND(V12>TODAY(),V12<X7),"True", "False") <---- Returns if they have been with us for 9 months to 12 months and needs to be invoiced!
That works, for their first year, then the following year it won't invoice them as they've been there for 24 months.
I was thinking about expanding my VLOOKUP in cell V12, that if there membership was over 12 months ago, to add 12 to it, but got confused!
Any suggestions on where to go from here?
One way to do it might be
Figure the number of months they've been a member, like say 34.
Use the MOD() modulus function with a divisor of 12 (months). This will discard the number of whole 12-month-periods (years) they've been a member and leave you with just the number of months since their last anniversary. So for 34, it'd give "10" months since their 2-year anniversary.
If the answer from #2 says they're getting close to renewal, like they're 9+ months in to their current membership year, invoice them.
Cell V12: =VLOOKUP(O12,'Youth Details'!$A$4:$H$95,8,0) <---- Returns their start date, like 1-Jan-2019
Cell V13: =DATEDIF(V12, TODAY(), "M") <---- Total # of months they've been a member, like 34
Cell W12: =IF(MOD(V13, 12) >= 9, "True", "False") <---- Returns if it's been 9+ months since their last anniversary and they need to be invoiced!
Of course, if you allow people to prepay, then like AakashM points out it's worth making sure you're not invoicing them for something they've already paid.

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