Let the present age of Meena be $x$ years.

According to the question:

$\begin{array}{l}
(x-5)(x+8)=30 \\
\Rightarrow x^{2}+3 x-40=30 \\
\Rightarrow x^{2}+3 x-70=0 \\
\Rightarrow x^{2}+(10-7) x-70=0 \\
\Rightarrow x^{2}+10 x-7 x-70=0 \\
\Rightarrow x(x+10)-7(x+10)=0 \\
\Rightarrow(x+10)(x-7)=0 \\
\Rightarrow x+10=0 \text { or } x-7=0 \\
\Rightarrow x=-10 \text { or } x=7 \\
\Rightarrow x=7 \quad(\because \text { Age cannot be negative) }
\end{array}$

Thus, the present age of Meena is 7 years.