I couldn't give for ages and had to get the Malaria Antibodies Test done (after picking something up in Central E Africa years ago). They've not allowed me to donate at other times because of my hazardous occupation (have to fit it in around work commitments) and have failed a few times on grounds of broken skin from sporting mishaps. But it is worth sticking with it and making that 3 times a year pledge.
I gave a pint in my lunch break today, and cycled home a few minutes slower than normal tonight, but enjoyed spinning a lower gear and to be honest, felt right as rain. I won all my commuter races too, although didn't see a road bike I sometimes take on - I think he uses that road for his recovery rides...
If you have fallen out of the habit, or never got into it in the first, I really urge you to do something about it.
Stig