I'm 71 and I have trouble throwing my leg over my bike - well, it's not the bike it's the saddle bag I've put on the back to hold my chain, lock, water bottle and a ball cap. It has tire repair stuff in one side pocket and a light rain jacket in the other side pocket.
I put a hand on one brake lever to hold the bike steady. Then I lean the bike way over toward me and throw my leg over the bag and on to the pedal. I know I could do it easier without the bag but I have a need for just about everything in it.
It's not some trivial issue. I can manage but I'm not getting younger. I'm fine at traffic lights I can straddle the frame... just barely. It's mounting that's tough, dismounting not so much
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You need a dropper seatpost!! I am almost 71, 5'6", and ride a medium Specialized Turbo Levo.