As long as you don’t have a pre-payment penalty (not allowed in USA) you can pay your 30 year mortgage every two weeks instead of every month and shorten the total term by a few years. Alternatively, if you can make double payments every month with the second earmarked all to principle, you can finish a 30 year mortgage in around 11 years. No refinance required.
We got a 15, saved every penny we could, and finished it off in about 18 months. But we went nuts because we just got sick of being in debt and would do anything to escape the weight of debt. Because of the sacrifice, I can retire in ten years, but we are pushing the envelope to see if I can do it in six years. TBD as luck and market timing are part of the hopeful, faster plan. That, and living off 30% of my income.
Suffer a tiny bit when you’re 20 or a tremendous amount when you’re 50!