Hi Ambrose, I can relate to how you feel, I'm only a year older than you, my five kids are a big younger, some leaving home and the feeling is that one's job is done..what next?

Starting your own business may be a good idea.
Make sure you do some kind of assessment of what demand there is for your product in your area, or where your markets may lie.

Be sure to have sufficient reserves to carry you through the initial startup costs and keep you going until you are making a profit.

Be ready for a drop in income and possibly long hours working.

But there are may advantages in working with your own hands to provide an income.
I wish you well!