At least in your 30's, you're still quite marketable from a re-dating standpoint (not that that alleviates the present existential pain). Losing someone in the 50's might arguably be worse
That's just not true, perhaps before the internet you couldn't exactly walk into every bar and meet as many interested people as you could when you are 30. Now you find just as many 50 year old on dating sites as you do as 30 year old's.