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Zerostar
@Chalfie
I'm 45 and I decided I was going to go for a sub 20 5. After a solid year of running 5km X2 most days to work and back, I went for it this year. I've done it and now I'm wondering if a 40 is doable. I'm currently at 45 I think.
I wasn't really a runner.
TL;Dr
Probably do able.