/ 21 Climbs for 21 Years...
Stanage or any of the main gritstone edges.
A better challenge would be to do 21 climbs on 21 different edges.
How about the 21st route described in the guidebook at 21 different crags?
Duncs did 50 for his 50th, and was finished by lunchtime, so it is very doable. He soloed most of them, and counted downclimbs as well as going upwards. He did it at Stanage, in August, rather than on his birthday in January! He had a little support team - one person to record the climbs, one to move the bouldering mat, one to take photos, one to lounge around looking good etc.... it was a great day! :-)
Stanage, Burbage North or Birchen are the obvious grit choices with lots of shortish routes. If you get an earlyish start you'll have time to do them roped. If you're soloing, 21 won't be any problem. If going at a weekend, Stanage North may be the least busy option.
Only limestone option I can think of is Harborough.
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