If you are over 40 years old then you are still ready to get a fitness model body. Once you are over 40, you have “muscle maturity” and the ability to retain hard-earned muscle much better than you may have realized!
Being over 40 means that you are outside the “18-34” primary demographic targeted by manipulative advertisers, so you are better able to discern what works for your specific situation. This means that you can make intelligent use of your money, discern what opportunities are best for you, and not be as easily swayed by deceptive advertising… although it still exists no matter what age you may be!
Finally, being over 40 allows you to commit to a lifestyle which benefits YOU first and foremost. While getting in shape to appeal to others is fine, you now can make the decisions to adopt healthy eating and exercise habits because you understand how they will make you healthier and possibly more radiant in the ensuing decade.
If you are uncertain as to where to start, consider this source which has help women get bodies like other fitness models over 40.