I've asked myself what will happen to my crypto portfolio is I lose my life but damn it's sad to think about how wasteful it could get, even if you leave it in the hands of someone they might decide to just spend it all and waste it once you passed, so I don't let this worry me, if it's my time to go then my crypto stays where it is.
It's going to be helpful still if you don't have anyone to give your private keys because you have to take the allocation off the table and it isn't coming back anyways, makes the whole Bitcoin even more scarce so do not worry much if you don't have anyone to pass your private keys unto, you are still doing every bitcoin holder a big favor.
There are so many ups and downs in this world, not everybody will have a good family, and not everyone will be good to you, it's is just a hard fact about life, so lead a good life while you are still breathing today and do try to find someone who you can trust, they don't have to be your age mate.
It can be worrying to consider that our valuable crypto assets could be lost after our passing. Have you ever considered putting in place a "dead man's switch"? Its a type of device, digital or otherwise, that starts working when you dont do something within a specific amount of time. If you dont check-in, lets say once every six months, it might send your private keys or some sort of instructions to a certain person or group.
In this manner, you might make sure that your cryptocurrency didnt simply disappear. I absolutely agree with what you said about trust. Age isnt a factor in finding that "someone"; rather, its about connection, comprehension, and most crucially, reliability. Everyone deserves to find that person, and I sincerely hope you do