Hi Flossie and welcome to the club. I'm 67 and also feel really well, and completely unmedicated. Diabetes was a shock when diagnosed just over 12 months ago. You are being very positive and pro-active and I take my hat off to you. Keep this up and you will beat this disease!
To answer your questions.
It is best to eat as soon as possible after you get up or your liver may dump glucose in your bloodstream in the belief you need extra energy with having fasted overnight. Also, exercise is better after meals as it may help bring your levels down. More strenuous exercise may raise levels initially.
Ideally it is better not to snack at all and to eat 3 evenly spaced meals, but we don't all manage this. Not snacking helps your levels drop nicely before your next meal. If you snack, it should be no carb food like cheese ideally otherwise any carbs will raise your levels, which may not come back down before your next meal is due. Most people on here snack on a few nuts or cheese.
The difference between your before meal and post meal (2hr) reading should be less than 2mmol/l, ideally under 1.5mmol/l
Most people say a short walk, even up and down the stairs for 10 minutes, lowers levels if you do it about 45 minutes to an hour after starting your last meal.
You need to set your own targets, and when you reach them, lower them again. The NICE guidelines are over-generous (under 7 fasting and pre-meal, under 8.5 at 2hrs after, but are OK for newly diagnosed still finding their feet)
These are my targets:
Fasting under 5.5
1hr after meals under 7.8, ideally less most of the time
2hrs after meals under 6.6
before lunch under 6
before tea under 5.5
bedtime under 5.5
regarding the cappuccino, try coffee with double cream instead of milk. Milk has a lot of sugar in it. Cream has none.