Is this a high mileage vehicle - transmission?
I would be looking at the TV linkage from the engine to the transmission. Broken bushing, it popped out of adjustment.
If you live in the snow belt areas , this linkage can corrode , become sticky.
Unless you have engine problems and you are stepping on the throttle harder while the engine is cold
Dont worry how old you are... it is the mileage on your body that adds up.