A few suggestions for "older" persons who want to learn a musical instrument, but have little or no music knowledge, and want to try it out without committing tons of time and money to something they might not like, or be willing to work at hard enough to be "good"...
So... Try a Baritone Uke.... Nicer sound than a Soprano uke, lower with not so much "tinkle". More "spacing" on the keys... easier to feel as well as see.
For starters, about a $40 investment for the package... Uke and cheap case.
Only four strings to learn, not 6.
Don't have to learn to read music. Use "Chord Boxes" little squares that show where to put your fingers.
Strings are nylon, instead of steel. Most appreciated by those poor souls who gave up the guitar, because it cut their fingers. Growing those callouses is not easy, and even harder when you get older.
For newbies, you don't play a melody with a ukelele (unless you're really, really good)... you just play chords, as shown on the music sheet chord boxes.
You can play about 50% of all songs, using only 6 or 7 chords.(
Doesn't mean you can change keys, but hey... you're not a pro yet.
If you learn the Baritone uke, it's the same as playing the smaller soprano uke.
If you decide to advance to the guitar, later, the top four strings are played exactly the same, you're just adding the two extra strings... and remembering where toput the extra finger(s).
This isn't for those who are really serious, or for those folks who have already found their way to being comfortable playing guitar, but kind of a short cut to enjoying music that you "make" yourself. There are hundreds of tunes you can play just by knowing 3 or 4 chords. If you know "Jada", you can play it with 2 chords.
If you're really thinking about taking up the uke, I'd suggest you don't look at the lessons that are showing on utube... They'll scare you. You can learn easier on your own from the booklet that comes with the uke, and find that you'll learn to "play by ear" rather than trying to learn the chord conversions and key transitions that the utube videos are prone to try to teach beginners.
That's my take on the subject... Not a pro, but it's the process I've used to start others on the way to enjoying making music the easy way.