What is the mileage on the transmission? If yu know
Was the old fluid real dirty and smell burned when the service work was performed?
Is the fluid level correct?
The lazy reverse could be hard seals, worn out clutch pack.
The fluid out the dipstick tube is usually an indication of a serious problem if the vent is not plugged up
Dont worry how old you are... it is the mileage on your body that adds up.