I turned 59 this spring. Good health. Though I do not know how many more years I will be able to do this work.
As to making a good living solo I think if my schedule was filled I would gross about $1,300 to $1,900 a week. $1,900 a week during the mowing season.
$33,800 to $49,400 mowing, plus fall and spring clean ups, plus snow which can never be counted on. So maybe another $10,000 a year.
$44,000 to $60,000 would make me happy though it would not make me feel rich.
If I had the business I could make more but I do not want to work 60 hours a week.