A lot depends on how much the repairs you mention will affect the price you can expect to get for the house, if you sell it without having at least done the re-wiring. Depending on how old the electrical installations are, you may not legally be able to sell unless you modernize them.
On the other hand, redecoration and a new garden gate will not significantly affect the value of the property, - a new driveway might.
Why not have one or two house agents come and give their evalutation of what you can expect realistically to get for the house if you put it on the market now, and what you could expect if you do the things you mention before listing it?
Is the layout of the house such that you could have a carer living-in later on, if this should become necessary?
If there space to make the house more handicap friendly if you are doing alterations - bathroom access for wheelchair or rollator, plus helper? If you want to stay in the house, that is.
Another consideration: can you afford the upkeep on your pensions once your husband retires, and when as time passes you no longer want or can do them yourself.? How large is the garden and who looks after it?
Public transport: is there any, or will you be housebound or forced to move when the day comes that one or both of you are no longer safe to drive? And come it will!
Moving: do you mean to somewhere smaller in the same vicinity, or moving away? It can be hard making new friends at our ages, if you move away.
What kind of other properties are available and how does their price and running costs compare to your present home?
There is an awful lot to consider here.
You say your husband isn't keen on moving but will do so if you really want to - this sounds like a recipe, if not for disaster, at least for the kind of recriminations later of "You wanted to move, I didn't!" "we would have been better off in our old house".
A four bedroomed house sounds very large to me, but I do realise that in the UK people attach an importance to guest bedrooms that we do not do, where I live, but are the three bedrooms you and your husband don't occupy, ever used?
Might you be able to rent one or two out, if you need the income later on?
There is a lot to be said for moving before you get too old to face it, but it is a difficult decision to make, so do please think carefully about the pros and cons of it.