On September 9, 2013, the Double Ninth Festival, Trillium Tea House welcomed 9 special old people. Their ages are 9 consecutive natural numbers, and the sum of their ages is 765. So how old is the oldest old man this year?
2013年9月9日重阳节那天，延龄茶社迎来了9位特別的老人，他们的年龄是连续9个自然数，年龄和是765．那么最大年龄老人今年多少岁．
<gadget id="calculator">765 / 9</gadget>
<output>85</output>

<gadget id="calculator">85 + 4</gadget>
<output>89</output>

<result>89</result>