Yes I think from young up to about mid forties we have 'next stage' normal goals that most humans end up doing.
So when you're in your twenties your looking for the one to marry with all that entails and trying to build your career. Everything is fresh and exciting and you're bursting with energy.
Next you're moving in together, maybe getting married which is alot of excitement and highs. You talk alot about the future and the goals you have together.
Next you are pregnant and everyone is fussing over you. The excitement of the new baby and all the new things you have to learn. Maybe a big promotion at work as you scale the ladder and become the boss. Maybe a move to your dream house that you've been saving so hard for.
Once you get to the next stage - kids no longer need you as much, career has stalled a bit or no longer holds the same enthusiasm and well you're just a tiny bit bored with your other half. Nothing is really 'wrong' as such but you're not sure what the next stage is. Life feels a bit directionless.
I think this is entirely normal around mid to late forties. When your parent dies you suddenly realise 'you're next' in your family and that you might only have another X years left. Death always makes you very aware of your own mortality. Suddenly it feels like you are wasting the time you have been given instead of making it count. You start to feel dissatisfied.
Between realising the bigger picture of this and there not being any natural next step goals I think you feel a bit lost, pointless and like you say 'I'll be dead soon so what's the point of most of it'
Someone I once knew said 'we're not here for a long time, we're here for a good time' and I like that. It says we are tiny insignificant dots so don't worry just try to find whatever bits of happiness and contentment you can.
For me as I am past that stage and older than you it's my pets who live in the moment and find joy in everyday. It's growing plants, fruit and veg and nurturing them. I have more appreciation of things I used to have no interest in at all such as world events and cultures, nature, weather, history. I've dabbled with some crafts. I support some charities. I certainly have days of nostalgia when I think of younger me striding out to my fancy car to go to my big job wearing my designer suits running my own team. The world felt at my finger tips and now I am a nobody and a nothing. I'm grey, I'm overweight, I'm exhausted, I'm invisible. However with age comes a quiet acceptance of the whole 'time to live, time to die, time to sow, time to pluck up what was planted, a time to laugh, a time to mourn.....
I hope you find your way. Hugs