i'm 58 years old, weigh 185lbs and am also a gym rat and i've got two kids (of course they are 30 & 34
) and i can do it.
get down low, keep it close to the body, get a good grip under it, lift with the legs and work those glutes and hump that thing up the stairs. if your tired when you get it up the stairs, put it down then use the hand cart. get a lifting belt and put it tight and up high with the buckle right over your navel.
now, get to it and show us (beyond what you wrote
) what your made of!
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