Table 2: Summary of the age estimates (in Myr).
Method Minimum Age Maximum
Log grav1 3 15 302
CMD, parallax3 3 5 8
HRD, parallax3 3 8 20
Disk fraction 4 7 15
W(H$\alpha $) 4 7 15
W(Li) 5 10 15
A(Li) $\sim$3 $\sim$8 15
1 Only for 2M1139 and 2M1207.
2 Based on spectral synthesis, the upper limit
for the age is 15 Myr, with $T_{\rm eff}$ = 2550 K.
3 Only for those having parallax.

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