Would it be too late to straighten someones curved spine when they have reached physical maturity?

No: For significant curves, surgery is often chosen later in life because the recovery is so long it would interfere with working and raising families. The aging process may make curvatures more painful, consequently the surgery more desirable, despite the difficult recovery. Reconstructive spine surgeons and physiatrists can work together to recomend the best timing and rehabilitation.

No, as long as the : Surgery is indicated.