I'd be fine living alone. I craved it when I was in houseshares and it probably is my default setting tbh. That said I lived with a filthy slut mare girl in one of them- she put me off cohabiting more than any bf!
It's not for everyone though. My mum would also be fine on her own if widowed, once the initial shock wore off, I think but my v domestic grandma coped technically very well but was lonely and my aunt - who has a spouse in a carehome, was always busy and not a homebird and did ok til lockdown. Then she fell to bits and hasn't bounced back. She felt imprisoned. In contrast I did most of week alone in lockdown until DP moved in fully and was content 95% of the time.
As it is, I feel lucky to have some balance- I love DP so much but he's good at pulling his weight when here and whilst I miss him now he's working away every mon eve-thurs eve, it means I'm so happy to see him AND have the benefit of pleasing myself 3 nights a week. I'm enjoying that whilst I have it -he's homesick and job hunting, although the odd alone night when my anxiety kicks in is tough. The overall upsides are someone to help with jobs I don't like, be there when I'm sick and just living with my best friend.
I feel lucky in him though- I don't automatically seek to live with others again, especially any man who expects a mummy or just anyone I think is mucky and needs a housekeeper.