Jen was one year old when her grandmother opened a mutual fund in her name and deposited $$20,000$ into the account. The account has earned an average annual rate of return of $10\mathrm{.}2$ percent. Today, the account is valued at $$126,613\mathrm{.}58.$ How old is Jen?

$26\mathrm{.}56$

$20$

$18$

$39\mathrm{.}56$

$19$