A fashion model is done by 28 (if she's lucky). A commercial model can work for longer, but work tends to get less consistent. An art model can work forever if she does it right. Most glamour models are done by 30ish too. Adult models depend on how they look, but the older you get, you tend to need to go to higher levels if you want consistent work. Fetish models...well...there are granny fetishes so I won't comment. Unlike pretty much every other industry in the world, you don't increase your knowledge, experience and get more valuable - you lose value with every year. It's unfortunate, but if you want to be a model you also need an exit strategy; you need something to do after you're done modeling.
It's great to make good money when you're young - maybe you can save and make a property portfolio (if you're making that kind of money), invest in training or a new business. Maybe you can make contacts and arrange something related to the industry that will keep paying. Either way - you need to think about it now. Nobody wants to employ a washed-up 30yo woman with no work experience outside of modeling - try to explain to people that it's a hard industry and that you actually worked in accounts, marketing, pr, customer service and the most fickle industry in the world for 10 years. It won't get you the job.
This is a pretty short post, and there's only one point I want to make - think about what you're going to do afterwards, and start preparing.