Thank you for the opportunity to help you with your question!
There are major difference that can be observed at the age of 75. white hair, drowning teeth, wrinkles on all over the skin, dark circles, drowning eye brows, and shaken legs. I think that i would be looking like a cute old fellow if i reach at the age of 75.
Please let me know if you need any clarification. I'm always happy to answer your questions.