Table 2: Estimated ages for the YLA published in the literature.

Association	Estimated age	Method	Reference
TW Hya	10 +10-5 Myr	Spectroscopy + HR diagram (BVI)	Soderblom et al. (1998)
	8 Myr	HR diagram (JHK)	Webb et al. (1999)
	5-15 Myr	HD diagram (IR)	Weintraub et al. (2000)
	8.3 Myr	Expansion age	Makarov & Fabricius (2001)
	4.7 0.6 Myr	Expansion age	Makarov et al. (2005)
	20 +25-7 Myr	Expansion age	Mamajek (2005)
	8.3 0.8 Myr	Dynamical age	de la Reza et al. (2006)
	10 +10-7 Myr	Spec. + HR diagram (VIJK) + Li + H	Barrado y Navascués (2006)
Tuc-Hor/GAYA	40 Myr	H emission	Zuckerman & Webb (2000)
	10-30 Myr	X-ray emission	Stelzer & Neühauser (2000)
	30 Myr	Kinematic + HR diagram (BV)	Torres et al. (2000)
	10-40 Myr	HR diagram (VRI)	Zuckerman et al. (2001b)
	20 Myr	Kinematic age	Torres et al. (2001)
	27 Myr	Dynamical age	Makarov (2007)
Pic-Cap	20 10 Myr	HR diagram (BVI)	Barrado y Navascués (1999)
	12 +8-4 Myr	HR diagram (VI) + Li	Zuckerman et al. (2001a)
	11.2 0.3 Myr	Dynamical age	Ortega et al. (2002)
	12 Myr	Dynamical age	Song et al. (2003)
	22 12 Myr	Dynamical age	Makarov (2007)
Cha	5-15 Myr	HR diagram (BV)	Terranegra et al. (1999)
	3-5 Myr	HR diagram (VI)	Feigelson et al. (2003)
	7 Myr	Dynamical age	Jilinski et al. (2005)
Cha	2-18 Myr	HR diagram (R) + Li	Mamajek et al. (1999)
	10-15 Myr	Dynamical age	Mamajek et al. (2000)
	5 4 Myr	HR diagram (VRI)	Lawson et al. (2001)
	6 +2-1 Myr	HR diagram (JHK)	Luhman & Steeghs (2004)
	7 Myr	Dynamical age	Jilinski et al. (2005)
HD 141569	5 3 Myr	X-ray + Li + HR diagram (JHK)	Weinberger et al. (2000)
	4.7 0.3 Myr	Spectroscopy + Kurucz's (1993) models	Merín et al. (2004)
Ext. R CrA	10-15 Myr	HR diagram (BVRI-JHK)	Neuhaüser et al. (2000)
	15 Myr	Dynamical age	Quast et al. (2001)
AB Dor	50 Myr	H emission	Zuckerman et al. (2004)
	75-150 Myr	HR diagram (VK)	Luhman et al. (2005)
	30-50 Myr and 80-120 Myr (2 subgroups)	HR diagram (VI) + Li	López-Santiago et al. (2006)
	38 Myr	Dynamical age	Makarov (2007)
	118 20 Myr	Dynamical age	Ortega et al. (2007)