One big regret my husband and I have is that we didn’t contribute enough to our 401K earlier in our career. Right now my husband maxes out + 4.5% from employer and I put in 10% + 5% from employer. My husband has the option of choosing a Roth 401K so half of his 401K is after tax just to hedge against excessive tax increase in the future. We also refiananced our mortgage to a 15 yr term and hope to pay off the house when we are 50. If everything goes as planned we can retire at 60. But job loss or other unplanned events such as health problem, or collaspe of the stock market can derail it. We are also lucky to have pension plans provided by our employers. Social Security will be there but I don’t expect it to be much.
If there is a young person here my advice is to max out on 401K and spread out your investments.