3. The residents of the Immortal Island celebrate their birthdays every 3 years. Xiaohuaxian had her first birthday at the age of 1, and her second birthday at the age of 4. She receives a number of gifts equal to her age each birthday. By the time she finished celebrating her birthday this year, Xiaohuaxian had received a total of 70 birthday gifts. How old is Xiaohuaxian this year? $\qquad$ years old.
$19$