I'm 60 this year, work full-time and find my SANITY in my yard and gardens.
We did hire a couple of neighborhood teens to mow the grass last year - they are starting a business and offered a great price. They charge us $15 a time and only cut when it's needed. Takes them all of 10 minutes and saves me at least 45 minutes a week. I CAN do it... I just don't ENJOY doing it, so that was a good trade-off. We are in the process of getting rid of bushes that require trimming two or three times a year - not interested in doing that kind of work anymore. Again - I can, I just don't want to. We had three big hedges that were almost 30 years old - they were ready to go. Replacing them with easier care plants and in one area just expanded the food growing space!
We hire out major tree trimming, but otherwise we do all the routine maintenance, planting, weeding, watering, pond care, etc. We enjoy it, it keeps us moving and outside, in the fresh air and sunshine, keeps us in touch with our neighbors... don't foresee stopping any time soon!