Mod Rewrite file.php? to string - .htaccess

Question

I have old site with links like this:
http://domain.com/image.php?690
And I would like to change it into:
http://domain.com/old690
I have tried many different Rules, fe.:
RewriteRule ^image.php?(.+) old$1 [L]
EDIT: All rules looks like:
RewriteEngine On
RewriteRule ^admin/(.*) ninja-admin/$1 [L]
RewriteRule ^index.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . index.php [L]
RewriteRule ^image.php\?(.+) old$1 [L]
What is correct RewriteRule, and why?

Answer 1

You're doing it upside down.
Put this code in your htaccess
RewriteEngine On
RewriteBase /
RewriteRule ^old([0-9]+)$ image.php?$1 [L]
RewriteRule ^admin/(.*)$ ninja-admin/$1 [L]
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^ index.php [L]
The rule for your images is the following
RewriteRule ^old([0-9]+)$ image.php?$1 [L]
It will forward every url like /old123 (where 123 is one or more digits) to image.php?123
EDIT: if you want to forbid direct access to image.php?xxx then you can do it this way
RewriteEngine On
RewriteBase /
RewriteCond %{THE_REQUEST} \s/image\.php\?([0-9]+) [NC]
RewriteRule ^ old%1 [R=301,L]
RewriteRule ^old([0-9]+)$ image.php?$1 [L]
RewriteRule ^admin/(.*)$ ninja-admin/$1 [L]
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^ index.php [L]

Answer 2

I use this so http://example.com/old4444 forwards to http://example.com/image.php?file=4444.
Also, the browser will keep http://example.com/old4444 in the address bar.
RewriteCond %{QUERY_STRING} !marker
RewriteCond %{QUERY_STRING} file=([0-9]+)
RewriteRule ^/?image.php$ %1? [R=301,L]
RewriteRule ^/?old([-a-zA-Z0-9_+]+)$ image.php?marker&file=$1 [L]