> When you're young is OK to have a high percentage of your net worth in a house, but not when you're getting close to retirement.
That said, if you actually own your home in retirement you've significantly mitigated against the risk of getting priced out by rising rents if the regional economy heats up. That could be a problem on a fixed income.
However, the risk is that you have a 60 year old, nearing retirement with 90% of his/her net worth locked up in an asset. They are counting on being able to sell and use the equity for retirement.
If you own your home outright and have a nice chunk of cash in retirement funds, then you're fine. Of course that also means you're very diversified (some cash in real estate, some cash in the market).