how to calculate selected row table in React js

can someone help me please can someone help me please can someone help me please can someone help me please can someone help me please can someone help me please can someone help me pleasecan someone help me please how i calculate the selected age from the table ? im using ant design table i really confused how to use the selected data i want to calculate all selected ages ``

 const columns = [
      {
        title: 'Name',
        dataIndex: 'name',
      },
      {
        title: 'Age',
        dataIndex: 'age',
      },
      {
        title: 'Address',
        dataIndex: 'address',
      },
    ];
    
    const data = [];
    for (let i = 0; i < 46; i++) {
      data.push({
        key: i,
        name: `Edward King ${i}`,
        age: 32,
        address: `London, Park Lane no. ${i}`,
      });
    }
    
    class App extends React.Component {
      state = {
        selectedRowKeys: [], // Check here to configure the default column
      };
    
      onSelectChange = selectedRowKeys => {
        console.log('selectedRowKeys changed: ', selectedRowKeys);
        this.setState({ selectedRowKeys });
      };

      render() {
        const { selectedRowKeys } = this.state;
        const rowSelection = {
          selectedRowKeys,
          onChange: this.onSelectChange,
          selections: [
            Table.SELECTION_ALL,
            Table.SELECTION_INVERT,
            Table.SELECTION_NONE,
            {
              key: 'odd',
              text: 'Select Odd Row',
              onSelect: changableRowKeys => {
                let newSelectedRowKeys = [];
                newSelectedRowKeys = changableRowKeys.filter((key, index) => {
                  if (index % 2 !== 0) {
                    return false;
                  }
                  return true;
                });
                this.setState({ selectedRowKeys: newSelectedRowKeys });
              },
            },
            {
              key: 'even',
              text: 'Select Even Row',
              onSelect: changableRowKeys => {
                let newSelectedRowKeys = [];
                newSelectedRowKeys = changableRowKeys.filter((key, index) => {
                  if (index % 2 !== 0) {
                    return true;
                  }
                  return false;
                });
                this.setState({ selectedRowKeys: newSelectedRowKeys });
              },
            },
          ],
        };
        return <Table rowSelection={rowSelection} columns={columns} dataSource={data} />;
      }
    }
    
    ReactDOM.render(<App />, document.getElementById('container'));

``