Eh, disagree on numerous counts.
- My four-years out of college daughter's friends are also buying houses; several are both homeowners AND parents. My girls are the "younger ones" in the extended family, and 100% of the older cousins (none are 30 yet) are home owners.
- Paying for a house for a full 30 years is a questionable choice -- questionable as long-term stability goes. As you said, "throw extra money at it" every month -- even if it's only $50 or so -- and it'll slash your period of indebtedness exponentially. My husband and I paid off our first house (30 year mortgage) in 11 years, and we were able to pay cash for our second house. Really, it's about attacking the principle and staying ahead of your amortization schedule.
- My 21-year old college senior is already more than 10% of the way to that 200K goal ... and that's working part-time /putting her education first.
- My younger daughter and I don't so much have "an agreement" ... it's more that she set herself a goal. She set this goal after her sophomore year in college when she got serious about her college major /potential earnings. She decided she had to figure out a way to reconcile her career goal with the lifestyle she wants to live ... so she asked me to help her with some numbers /what she might need to invest "up front" to be able to retire comfortably one day in light of a small paycheck.
- I'm fine with her living here as long as she wants, but -- more importantly -- she's comfortable here. We have not discussed five years; someone asked how long this might take, and I threw out a guess that seems achievable for anyone who's trying to meet such a goal. I really anticipate my daughter will do it in less.
Last thought: You know that saying, Whether you think you can or whether you think you can't, you're right? I think that applies here. Obviously you know your own business, but I went from being a free-lunch kid to being quite comfortable. I don't say that to be braggy, but it's possible. It requries long-range planning and sacrifice (especially in the beginning while the magic of compound interest is still strongly on your side). We only had one car for the first three years of or marriage, we rarely ate out, we bought clothing from thrift shops ... but we're going to retire in our early 50s.
Real last thought: I wish you nothing but luck with the path you've chosen, though it's not the same as the one for which my girls have opted.