On the day of "Double Ninth Festival", 25 elderly people came to Trillium Tea House to taste tea. Their ages are exactly 25 consecutive natural numbers. Two years later, the sum of the ages of these 25 old people is exactly 2000. How old is the oldest person among them?
"重阳节"那天，延龄茶社来了25位老人品茶．他们的年龄恰好是25个连续自然数，两年以后，这25位老人的年龄之和正好是2000．其中年龄最大的老人今年多少岁．
<gadget id="calculator">66 + 24</gadget>
<output>90</output>

<result>90</result>