I don’t think 60yrs is too old for pressure washing as long as are not an unfit, lardarse.If you are a fit 60yr old then no problem. I’m 57yrs with 2 artificial hips and work harder than my son who is 26yr. But like Yada I use a van mounted system and have everything set up for speed (which also tends to make things easy)I wouldn’t like to be lifting a GX390 pressure washer out of the van or be dragging it around a house or garden. even wrapping up 40m of high pressure hose can start to get tiring at the end of the day.If you can afford it buy a jetter and van, even a quality used system off EBay