About $500K all in for college and med school, somewhat less if you go to state schools or have a college scholarship. Most schools will admit without regard to ability to pay, and provide scholarships or loans.
To become an aeromechanic, you need a minimum of a high school diploma and several years of on-the-job training. Most aeromechanics have also completed college program in aircraft maintenance or a four-year apprenticeship program.
After high school, 4 years of undergraduate college, followed by 5-6 years of graduate college, followed by 2-3 years of post-graduate research. Sometimes you can skip the post-graduate. --> you should be 27 or 28 by the time you finish graduate college.
College Welding Certificate: About 6 core welding classes College Welding Advanced certificate: Certificate + about 6 Advanced welding classes Associates Degree in Welding: Certificate + Advanced Certificate + about 8 General Education classes.