Hi, yes there is no time as well as age limit to pursue what you want. There are many ways in which you can pursue Aeronautical Sciences and/or Astrophysics. But, before anything you will have to decide what you really wish to do Aeronautics or Data Science as these two are very different from each other. Once you have decided what you wish to do you can do on campus or distance learning in that field. You will find it a little difficult to cope up with the studies as its been a long time for you. All the best! Hope this helps.