People differ in their level of risk aversion and attitudes toward money. I don’t think it’s entirely crazy for your dad to borrow a limited amount, but life has a way of throwing up unanticipated twists.
My basic rule of thumb for parental borrowing was to limit the total to an amount that was under my net worth, considering assets that I didn’t want to cash out but could in an emergency. For example, I had cash value in a life insurance policy – I didn’t want to cash that out or borrow against it, because I preferred to keep that policy and continue to let it grow in value. But if took a parent PLUS loan that was less than the life insurance cash value, I would know where I could go for the money, if for any reason I lost my job.
I am age 63 and in good health, and like your dad I hope to continue to work until age 70. But my same-age ex-husband is disabled and getting worse by the day, and his social security is not enough to meet his expenses, so my adult kids are now shouldering the burden of filling the gap to support him. That isn’t something he planned – but if he had conserved money and saved up for retirement, he wouldn’t be relying on his kids for financial support.
Anyone can get sick and lose their primary source of income any time, but the odds are greater for individuals in their 60’s.
The problem with your dad’s plan to take a loan on the house in a few year is simply that he doesn’t appear to have enough equity in the house to qualify.
If your dad was forced to retire early for health reasons, would his retirement income be sufficient to pay the mortgage and other expenses?
Those are tough questions to ask – but especially with your education plans I think you need to ask them. I am saying that because MBA programs are pricey, so you aren’t going to be able to get that business master’s degree you want if you have exhausted funds and taken on a lot of debt in undergrad.
I also avoided taking home equity loans for college spending for several reasons, but one was that I preferred the 10-year payoff schedule with the PLUS loans (which I intended to pay off even earlier, and did). That’s because I wanted the balance of any loan I took to be paid off during my working / income-producing years. I knew that 10 years after my younger child graduated from college I would be age 66, just the point at which I would become eligible for full social security retirement benefits. So I could plan around that … but if I had been age 62 when my D. started college rather than age 52… I would have had a different view.