I mean, it could be both good and bad depending on the person. My Dad worked physically demanding jobs, and would have been happy to retire and spend his time working on personal projects at age 60, and his health and well-being would have been better if he had not had to keep doing exhausting work for at least 8 more years for money reasons. So, I think people feel justifiably protective of our elders when people talk about raising the retirement age.

Honestly, the jobs where the benefits of stimulation and social interaction outweigh the physical and or mental stress of the job are not the kind of jobs most people have. So if you wanted to do what’s really best for most older people, it would be better to find ways to engage them other than financially forcing them to keep working whatever job they can get - which is what raising retirement age does.

What would be really killer would be finding more ways to enlist retirement-age professionals in training young people, in a variety of occupations from carpentry to programming. The young have the stamina and strength but lack wisdom; the older people have learned a lot and could share that knowledge and wisdom.