What kind of bike are you riding? and I assume this isn't a race.

I completed a tour where we had 65 mile days back to back w/ headwinds. All told we did 430 miles in one week. I went into it having done a metric century but not back to back.

I didn't have any trouble and was able to a century on the 4th day and ride 45 miles again the next day.

The key was to pace myself and never pass up a rest stop w/ a chance to eat, drink and be merry.

Having a week in between will be a piece of cake for you - have the massage just because they feel good

BTW - I am 50 years old and was riding a specialized Sequoia road bike if that makes any difference

I say go for it! you will do great