Ayden Tan Breaks 6th (And Probably Last) 11-12 National Age Group Record of the Summer

2025 Far Western Championships

• July 31-August 3, 2025
• Morgan Hill Aquatics Center, Morgan Hill, California
• Long Course Meters (50 meters)
• Meet site
• Results on Meet Mobile

12-year-old Ayden Tan from San Ramon Valley Aquatics has put an exclamation mark on an electric record-breaking summer. In what his dad says will likely be his last National Age Group Record of the summer before aging up next month, Tan swam 24.95 in the 50 free at the Far Western Championships in California.

That breaks the prior record of 24.98 set in 2017 by another Californian Ronald Dalmacio of Rose Bowl Aquatics.

Tan’s prior best time in the event was a 25.12 he did a few weeks ago at the Adam Szmidt Age Group Championships. That ranked him 4th in the age group.

All-Time Top 10, Boys’ 11-12 50 Meter Free, U.S. History

1. Ayden Tan – 24.95 (2025)
2. Ronald Dalmacio – 24.98 (2017)
3. Thomas Heilman – 25.02 (2019)
4. Michael Andrew – 25.09 (2012)
5. Rafael Gu – 25.31 (2017)
6. Winn Aung – 25.42 (2015)
7. Greg Pelton – 25.51 (2003)
8. (TIE)
   • Will Tarvestad – 25.53 (2013)
   • Vinny Marciano – 25.53 (2014)
10. Sheldon Lamb – 25.57 (2024)

At Far Westerns, Tan won all seven of his individual races for 11-12s at the historic championship meet, including several other best times.

His full register of individual results:

• 50 free – 24.95 (1st) – PB
• 200 free – 2:00.88 (1st) – PB
• 50 back – 28.86 (1st) – PB
• 100 back – 1:04.92 (1st)
• 200 back – 2:14.43 (1st)
• 50 fly – 26.96 (1st)
• 100 fly – 1:00.32 (1st)

He also split 56.38 on a leadoff in the 100 free on the winning 400 free relay, 25.07 on the leadoff of the winning 200 free relay, 1:11.28 on the breaststroke leg of SRVA’s 3rd-place 400 medley relay, and 28.86 on the backstroke leg of SRVA’s 4th-place 200 medley relay.

Tan, who swims for San Ramon Valley Aquatics, has been on a record-breaking streak this summer. He also broke the 100 yard IM record in Rohnert Park, California in mid-June, the 200 meter IM record in early July, the 100 meter free record in July in Santa Rosa, and the 50 meter fly and 200 meter IM records two weeks ago. This gives him six total National Age Group Record swims in summer 2025, which add to his five National Age Group Records in the 10 & under age group from 2023.