I remember 25 pounds per arm was the most I could manage pre-T for bicep curls... it was a plateau that I just couldn't break. Then T happened. Granted, I only got up to 30-35 lbs on the curls before I stopped working out. I'm looking forward to the day when I can start working out again.
Oh yeah--and pushups are more fun now. Can't wait 'til I can do those again, too.