I'm 35, personal best on the 5k is 21:06, and on the 10k is about 44:30.
I'm working on a medium-term goal: trying to get to a sub-40 10k before I turn 40. This means cracking 44 minutes before I hit 36, 43 minutes before I hit 37 etc. Thought I was going to do the sub-44 a couple of months ahead of schedule last weekend, but then my shoelace came undone at 6.5k, and I arrived at the 10m of vertical gain in 100m of distance a kilometre later. Came in at 44.39. Still happy with my run, though, and I have a nice flat 10k next month that I'm quietly hopeful for.