Don't think this is difficult, nor that age bears any relation to whether or not you can have sleek smooth sexy arms and shoulders - all it takes is a bit of time and motivation - after all, who wants to cover up all of the time?
Going on diets, cardio at the gym or anywhere else, resistance training - all are great. Spot toning is what will succeed on those areas that you specifically want to improve, be they arms, waist, core, bum or thighs. Don’t listen to anyone who says they don’t work, they do. And I know these things.
I go to a gym when I travel, and work out at home when I’m in the UK. It’s worth building up a small amount of kit to use at home, in this case particularly hand weights, then there are no excuses, you don’t have to go out and you can use any spare moments you have.
There are several very good 10 minute workout segments for arms now available on YouTube and you can do a different arms segment every day if you want. Be aware that what seem to be light weights to start with get heavy very quickly as you do a lot of repetitions, so start with something easy.
Cindy Whitmarsh 10 Minute Solutions Arms
Pilates Perfect Body Arms
Rapid Results Pilates Arms Workout
With weights you'll want to start low but you'll probably be surprised how quickly, if you do one of these routines regularly, you can do a heavier weight. John Lewis have hand weights that go up to 4kg (pictured above) and they go up in 1kg rises.
If you want to move up from there then you're best to look at something like these Fitness Mad neoprene dumbells (delivery is free).