use the s&p500 as a pension?

Hello everyone,

I'm fairly new to this and I've never worked with index funds before.

Would using the s&p500 very long term, be a good idea as a 'pension' of sorts? Because of its good track record of returns.

If I was to constantly invest each month for the next 30 years, and then slowly withdraw after that, would this be a smart move?

Thanks in advance.