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Fitness age change

my age is 51 and my watch used to give me a VO2 max fitness age which was 26. It has now changed so that I don't get the fitness age on theVO2 max but it has a link which I hit and over night it has gone to 45. 
im not sure why this happened or what it means can any one help. Also how do I get my VO2 max age back.